Four PVC pipes with the length of 1500 millimeters and inner diameter of 160 millimeters were used to make a consolidation device with a drainage system at the bottom, in order to make a study on the relationship between surface sedimentation and water discharge with time at different heights (the heights were adopted as 150 millimeters, 250 millimeters, 300 millimeters, 350 millimeters respectively) of red mud tailings of Pingguo Aluminum. A test was conducted on the mud discharge of the first layer and second layer respectively. It is shown that when the red mud is discharged at the first layer and the second layer, the sedimentation of which increases with the increase of height. The sedimentation curves of the first layer with 300mm, 350mm heights and the second layer emissions have two turning points. The red mud sedimentation rate of the height of 300mm is faster than the other three and the gap of the water discharge between heights of 250 millimeters and 300 millimeters is about 100 gram. The water discharge of the second layer is smaller than the first layer, of which the gap is about 250 gram; the decreasing rates of the red mud void ratio of the first layer and the second layer are the same, but the decreasing speed of void ratio of the first layer emissions is much faster, and the final void ratio tends to be between 1.22 ~ 1.26; The density curve experiences two processes of increase and two processes of decrease after the mud of first layer and second layer are discharged respectively, then tends to be stable and the stable value is between 2.01 and 2.06 g/cm3.